To me it is a surprise really. Because, I believe Liverpool isn't the best team in my eye. Real Madrid has always been the best team, and even last year they were, but they faced some injuries. But, when we are dealing with a new Real Madrid, without injuries and added Trent? They are going to be much much better. Many of the injured players are getting back too. Only question left is, what is wrong with Mbappe?
Best on paper is different from best on the pitch. Last season, Madrid was not the best team; they were not even among the top 3 best teams with injuries or no injuries. They played very badly and struggled in almost every game. PSG, Barcelona, Inter, and Liverpool were all better teams than Madrid last season.
For this season, on paper, Liverpool looks like a top team. Remember, by this time last year, everybody was talking about how Madrid would be unstoppable and how Barcelona wouldn't win any trophy in the league because Madrid signed Mbappe, yet Madrid ended up winning no trophy. We won't really know which teams will be good till the season starts, and we also have to remember that teams will still make additions to their teams. For now, PSG, Liverpool, Barcelona and Madrid are all among the favourites, but we won't know till next season.